<!DOCTYPE html>
<html lang="cn">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>键盘焦点</title>
    <link rel="stylesheet" href="../css/jianpan.css">
  </head>
  <body>
    <button class="q1">按钮1</button>
    <button class="q2">按钮2</button>
    <button class="q3">按钮3</button>
    <button class="q4">按钮4</button>
  </body>
</html>
